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Add 5/21 and 70/9

1st number: 5/21, 2nd number: 7 7/9

5/21 + 70/9 is 505/63.

Steps for adding fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 21 and 9 is 63
  2. For the 1st fraction, since 21 × 3 = 63,
    5/21 = 5 × 3/21 × 3 = 15/63
  3. Likewise, for the 2nd fraction, since 9 × 7 = 63,
    70/9 = 70 × 7/9 × 7 = 490/63
  4. Add the two fractions:
    15/63 + 490/63 = 15 + 490/63 = 505/63
  5. In mixed form: 81/63

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